How to make a fantastic cardistry magician playing card deck? 300/310gsm German black core paper seems to be the standard configuration of cardistry playing cards designed by our manufacturer in China. The premium linen of the black core paper enhances the smoothness of the cards, making the cards easier to operate. With the protection of the soft-touch semi glossy varnish, the card from our factory and supplier is more durable and smooth. It will not deform because it’s able to stand up to every single creasing, bending and tearing.